It is possible that Kalego will not agree to Iruma being the new mafia boss, because a 14-year-old boy knows nothing about finances and business administration, and how to calculate Pi in the financial field.
And maybe in the next chapter where I think Kalego will appear, maybe his older brother Narnia will also appear who is either part of the secret police, but is very good friends with Baal or Narnia is part of the mafia organization led by Baal, which is the rival of the mafia organization where his younger brother Kalego works.
As for the Opera, he/she effectively puts you on the ground even when wearing handcuffs. That's why I'm going to say the supremacy of Opera.
And by the way, this manga is a monthly manga.